I also agree that the Adcom has GOT to go! In addition, I would say GET SOME TUBES. Given the resolution oriented amplification and speakers that you have, and the fact that you like acoustic guitar and vocals, you could do very well with SOME tubes somewhere in the system. A good way to try both recommendations might be to pick up a tube dac like the Cal Labs Alpha. $3-400 used, plus $50 or so for a digital cable, and you can try an upgrade to your digital as well as some tubes, without too much pocket-ache. Lastly, don't despair - identifying a sound that you don't like is an important step towards finding that ultimately satisfying system. And for most of us audio nuts, that last step always appears within our graps but just out of reach .....
It's not the sound I want!
My system consists of a Krell kav300i, Aeriel Acoustic 6s and AdcomGCD750. I have Cardas cables , Jenalabs interconnects and Synergistic Research ac chords. It sound great at times but I find many cds hard to listen to. I listen to vocals with acoustic guitar and the guitar sounds detailed but so metalic and unnatural. It sounds like sombody is playing a saw with a bow. Is this what digital really sounds like? Is it sytem matching? I dont think it is the speakers. Is it just a matter of settling for the best we can get for $8000.00 and limiting what we listen to?